Pet bed with extension



FIG. 1 is a perspective view of a pet bed, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a pet bed with extension, as shown and described. 